A photo posted by @krisjenner on

Whoa—talk about a bathing suit blast from the past!

Kylie Jenner has been celebrating her 18th birthday with close friends, rumored beau Tyga and sister Kendall Jenner in Mexico and parading sexy bikini after sexy bikini on the beach while she's at it. But the E! star stepped out Aug. 12 sporting a look that was, well, mighty familiar—especially to mom Kris Jenner.

Kris took to Instagram with a side-by-side comparison of she and Kylie rocking the ultra high-cut style (hey, it was made in the '80s), calling her newly legal daughter out on swiping her old swimsuit for vacation.

"Ohhhhhhh so THIS is where my vintage Body Glove bathing suit went!!!! @kyliejenner you are grounded! Wait, I can't do that anymore you're 18....#whoworeitbetter #80's #whoknewyouwouldlikemyoldstuff #recycle #love #mexico #alcapulco1989," the proud momager jokingly wrote alongside the snaps.

The super-hot monokini in question is a neon pink one-piece with "Body Glove" scrawled in orange across the chest—from, according to Kris' caption, 1989. Yep, that means the suit is older than Kylie herself. (Gotta say, it holds up well!) We know that Kylie is sister Kim Kardashian's sartorial mini-me, but the side-by-side with momma Kris proves that they can be style twinsies too.

We Mean, You Know We Have to Ask
Who rocked the "Body Glove" swimsuit better?
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